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I've both experimented and written extensively on the topic of exhaust mods for the 986 boxster. Simply installing a set of headers will not only fail to improve performance, it will render the vehicle non OBDII compliant as well. In short, there is no inexpensive way to improve the 986 exhaust system, or get around the issue of a CEL.
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Don't worry … I've got the microfilm.
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